condition mean min max ZT0-3 12.953462 12.953462 12.953462 ZT4-7 12.1156425 12.1156425 12.1156425 ZT8-11 12.6155755 12.6155755 12.6155755 ZT12-15 12.808141500000001 12.808141500000001 12.808141500000001 ZT16-19 14.505007500000001 14.505007500000001 14.505007500000001 ZT20-23 11.579077000000002 11.579077000000002 11.579077000000002